A kinetic study of the isothermal degradation process of Lexan® using the conventional and Weibull kinetic analysis

Janković, Bojan

doi:10.1007/s10965-008-9220-4

Cited by 10 publications

(4 citation statements)

References 60 publications

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Section: Thermochemical Recycling By Pyrolysismentioning

confidence: 99%

“…The thermal decomposition of PC has been experimentally and theoretically investigated since the 1960s 30,35–64 . In general, these articles discussed the mechanism and reaction kinetics involved in the thermal decomposition—including pyrolysis—of PC 35–57 . However, only few studies have focused on quantifying the chemical composition of the different fractions obtained at the end of the pyrolysis reaction 30,58–64 …”

Section: Thermochemical Recycling By Pyrolysismentioning

confidence: 99%

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The organic chemistry behind the recycling of poly(bisphenol‐A carbonate) for the preparation of chemical precursors: A review

Gilbert

Polo

Maffi

et al. 2022

Journal of Polymer Science

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Production and consumption of poly(bisphenol‐A carbonate) resins are seeing a worldwide increase. However, their usage lifetimes are short and their final disposition as landfills pose environmental and health risks, due to the release of toxic bisphenol‐A (BPA). The development of alternative recycling routes is thus becoming subject of increasing interest. In this review, the main recycling processes of poly(bisphenol‐A carbonate) are described and critically compared, with special focus on the chemical mechanisms. While mechanical recycling is possible, the end products are restricted only to polymer blends, whose main mechanical properties decrease with each compounding cycle. In turn, chemical recycling can produce BPA monomer and a variety of by‐products that can be used in different industries, including the polymeric field, as synthesis reagents and precursors. The operation conditions of each method are reviewed, as well as the different results obtained in terms of product yield, composition, selectivity and reaction times. Reaction mechanisms are described in detail and a view on the usability of each end product is offered.

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Section: Thermochemical Recycling By Pyrolysismentioning

confidence: 99%

Section: Thermochemical Recycling By Pyrolysismentioning

confidence: 99%

The organic chemistry behind the recycling of poly(bisphenol‐A carbonate) for the preparation of chemical precursors: A review

Gilbert

Polo

Maffi

et al. 2022

Journal of Polymer Science

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“…Several methods for quantitative analysis of the degradation kinetics have been proposed so far [20]. An isoconversional model of extensive application is due to Flynn-Wall-Ozawa (FWO) [21] which follows,…”

Section: Thermogravimetrymentioning

confidence: 99%

Cyclic olefin copolymer/layered silicate nanocomposite: solid and melt viscoelastic properties and degradation behavior

et al. 2012

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Organoclay nanocomposites based on cyclic olefin copolymer (COC) with various contents of layered silicate nanoparticles were prepared via melt blending. The influence of processing conditions and nanoclay content on solid state viscoelastic and melt rheological properties as well as thermal degradation behavior was studied. The state of dispersion was investigated using X-ray diffraction technique which showed a strong dependence on composition, where an exfoliated morphology was identified in high nanoclay loading. Besides, the processing conditions, i.e., screw rotation speed and mixing time were also found to strongly influence the state of nanophase dispersion. The rheological investigations revealed a remarkable increase in storage shear modulus and complex viscosity values upon nanoclay incorporation. Furthermore, dynamic mechanical analysis gave an evidence of increasing stiffness after nanoclay was added into COC matrix; however, no detectable change in glass transition peak was brought about. The results from thermogravimetry also exhibited a rising trend in thermal stability values as nanophase organoclay was incorporated, for which the random chain scission was suggested as the prevailing mechanism based on a theoretical analysis.

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“…The identiÞcation procedure of the probability distribution function was applied on two practical examples: (a) isothermal reduction process of nickel oxide under hydrogen atmosphere [25] and (b) isothermal degradation process of bisphenol-A polycarbonate (Lexan) under nitrogen atmosphere [26]. All isothermal data were obtained from the isothermal (static) thermogravimetric (TG) measurements.…”

Section: Introductionmentioning

confidence: 99%

Identification of the effective distribution function for determination of the distributed activation energy models using Bayesian statistics: Application of isothermal thermogravimetric data

Janković

2010

Int. J. Chem. Kinet.

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The new procedure for identification of the effective distribution function for determination of the distributed activation energy models, which is based on the Bayesian statistics, has been established. The five different continuous probability functions (exponential, logistic, normal, gamma and Weibull probability functions (the extended set of distributions)) were used for searching the most appropriate reactivity model for two heterogeneous processes: (a) the isothermal reduction process of nickel oxide under hydrogen atmosphere and (b) the isothermal degradation process of bisphenol-A polycarbonate (Lexan) under nitrogen atmosphere. Using the Bayes weights, it was shown that for both processes, the most suitable distributed reactivity model is the Weibull distribution model. The kinetic parameters (ln A, E a ) attached with the Weibull distribution model were calculated for both investigated processes, using three different computational methods (the maximum likelihood method (MLM), the nonlinear regression analysis (NRA), and the posterior mean (the expected value of

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A kinetic study of the isothermal degradation process of Lexan® using the conventional and Weibull kinetic analysis

Cited by 10 publications

References 60 publications

The organic chemistry behind the recycling of poly(bisphenol‐A carbonate) for the preparation of chemical precursors: A review

The organic chemistry behind the recycling of poly(bisphenol‐A carbonate) for the preparation of chemical precursors: A review

Cyclic olefin copolymer/layered silicate nanocomposite: solid and melt viscoelastic properties and degradation behavior

Identification of the effective distribution function for determination of the distributed activation energy models using Bayesian statistics: Application of isothermal thermogravimetric data

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